Mercurial > sqlpython
annotate cmd2.py @ 20:d6d64c2e3b98
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author | devlinjs@FA7CZA6N1254998.wrightpatterson.afmc.ds.af.mil |
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date | Wed, 19 Dec 2007 11:49:23 -0500 |
parents | 25f22e742a68 |
children | 8b55aaa52ce9 |
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1 """Variant on standard library's cmd with extra features: |
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2 |
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3 Searchable command history |
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4 Multi-line commands |
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5 Case-insensitive commands |
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6 Special-character shortcut commands |
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7 """ |
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8 import cmd, re, os |
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9 |
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10 class Cmd(cmd.Cmd): |
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11 excludeFromHistory = '''run r list l history hi ed li'''.split() |
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12 caseInsensitive = True |
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13 multilineCommands = [] |
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14 continuationPrompt = '> ' |
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15 shortcuts = {'?': 'help', '!': 'shell'} |
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16 def __init__(self, *args, **kwargs): |
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17 cmd.Cmd.__init__(self, *args, **kwargs) |
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18 self.history = History() |
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19 |
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20 def precmd(self, line): |
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21 """Hook method executed just before the command line is |
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22 interpreted, but after the input prompt is generated and issued. |
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23 |
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24 Makes commands case-insensitive (but unfortunately does not alter command completion). |
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25 """ |
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26 try: |
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27 (command, args) = line.split(None,1) |
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28 except ValueError: |
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29 (command, args) = line, '' |
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30 if self.caseInsensitive: |
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31 command = command.lower() |
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32 statement = ' '.join([command, args]) |
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33 if (not self.multilineCommands) or (command not in self.multilineCommands): |
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34 return statement |
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35 return self.finishStatement(statement) |
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36 |
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37 def postcmd(self, stop, line): |
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38 """Hook method executed just after a command dispatch is finished.""" |
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39 try: |
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40 command = line.split(None,1)[0].lower() |
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41 if command not in self.excludeFromHistory: |
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42 self.history.append(line) |
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43 finally: |
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44 return stop |
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45 |
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46 def finishStatement(self, firstline): |
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47 statement = firstline |
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48 while not self.statementHasEnded(statement): |
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49 statement = '%s\n%s' % (statement, raw_input(self.continuationPrompt)) |
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50 return statement |
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51 # assembling a list of lines and joining them at the end would be faster, |
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52 # but statementHasEnded needs a string arg; anyway, we're getting |
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53 # user input and users are slow. |
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54 |
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55 statementEndPattern = re.compile(r'[\n;]\s*$') |
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56 def statementHasEnded(self, lines): |
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57 """This version lets statements end with ; or with a blank line. |
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58 Override for your own needs.""" |
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59 return bool(self.statementEndPattern.search(lines)) |
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60 |
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61 def parseline(self, line): |
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62 """Parse the line into a command name and a string containing |
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63 the arguments. Returns a tuple containing (command, args, line). |
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64 'command' and 'args' may be None if the line couldn't be parsed. |
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65 """ |
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66 line = line.strip() |
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67 if not line: |
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68 return None, None, line |
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69 shortcut = self.shortcuts.get(line[0]) |
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70 if shortcut and hasattr(self, 'do_%s' % shortcut): |
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71 line = '%s %s' % (shortcut, line[1:]) |
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72 i, n = 0, len(line) |
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73 while i < n and line[i] in self.identchars: i = i+1 |
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74 cmd, arg = line[:i], line[i:].strip() |
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75 return cmd, arg, line |
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76 |
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77 def do_shell(self, arg): |
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78 'execute a command as if at the OS prompt.' |
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79 os.system(arg) |
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80 |
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81 def do_history(self, arg): |
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82 """history [arg]: lists past commands issued |
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83 |
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84 no arg -> list all |
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85 arg is integer -> list one history item, by index |
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86 arg is string -> string search |
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87 arg is /enclosed in forward-slashes/ -> regular expression search |
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88 """ |
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89 if arg: |
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90 history = self.history.get(arg) |
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91 else: |
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92 history = self.history |
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93 for hi in history: |
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94 hi.pr() |
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95 def last_matching(self, arg): |
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96 try: |
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97 if arg: |
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98 return self.history.get(arg)[-1] |
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99 else: |
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100 return self.history[-1] |
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101 except: |
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102 return None |
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103 def do_list(self, arg): |
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104 """list [arg]: lists last command issued |
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105 |
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106 no arg -> list absolute last |
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107 arg is integer -> list one history item, by index |
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108 - arg, arg - (integer) -> list up to or after #arg |
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109 arg is string -> list last command matching string search |
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110 arg is /enclosed in forward-slashes/ -> regular expression search |
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111 """ |
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112 try: |
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113 self.last_matching(arg).pr() |
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114 except: |
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115 pass |
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116 do_hi = do_history |
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117 do_l = do_list |
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118 do_li = do_list |
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119 |
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120 class HistoryItem(str): |
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121 def __init__(self, instr): |
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122 str.__init__(self, instr) |
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123 self.lowercase = self.lower() |
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124 self.idx = None |
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125 def pr(self): |
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126 print '-------------------------[%d]' % (self.idx) |
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127 print self |
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128 |
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129 class History(list): |
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130 rangeFrom = re.compile(r'^([\d])+\s*\-$') |
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131 def append(self, new): |
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132 new = HistoryItem(new) |
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133 list.append(self, new) |
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134 new.idx = len(self) |
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135 def extend(self, new): |
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136 for n in new: |
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137 self.append(n) |
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138 def get(self, getme): |
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139 try: |
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140 getme = int(getme) |
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141 if getme < 0: |
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142 return self[:(-1 * getme)] |
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143 else: |
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144 return [self[getme-1]] |
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145 except IndexError: |
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146 return [] |
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147 except (ValueError, TypeError): |
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148 getme = getme.strip() |
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149 mtch = self.rangeFrom.search(getme) |
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150 if mtch: |
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151 return self[(int(mtch.group(1))-1):] |
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152 if getme.startswith(r'/') and getme.endswith(r'/'): |
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153 finder = re.compile(getme[1:-1], re.DOTALL | re.MULTILINE | re.IGNORECASE) |
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154 def isin(hi): |
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155 return finder.search(hi) |
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156 else: |
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157 def isin(hi): |
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158 return (getme.lower() in hi.lowercase) |
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159 return [itm for itm in self if isin(itm)] |
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160 |
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161 |
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162 |